I'm not sure about a band with a crowd, but I recall a crowd scene in Macross Plus, and band scenes in To-Y, Kimagure Orange Road, and Ranma 1/2 Hot Fighting Song Contest. Wait, maybe Bubblegum Crisis for a band with a crowd.

Aquarian Age revolves around a rock band, and it contains several scenes of rock bands performing in front of audiences of varying sizes.

"If someone feels the need to 'express' himself or herself with a huge graphical 'singature' that has nothing to do with anything, that person should reevaluate his or her reasons for needing said form of expression, possibly with the help of a licensed mental health practitioner."